Biology, 20.11.2020 20:10 glass60

PLZZ HELP...i've been trying to figure this out but its just not clicking for me. Use the information given in the images above to answer the following questions.
A Punnett square should be used to find each answer.
1. What is the chance that their child would have unattached earlobes? ¬¬¬_

2. Beyonce has a straight hairline, which is a recessive trait. Bruno also has a straight hairline. What is the chance that their child would have a widow’s peak? _

3. Beyonce has no dimples (Dd). Bruno has dimples, which is a recessive trait. What is the chance that their child would have dimples? _

4. Beyonce has a cleft chin (CC). Bruno has a smooth chin, which is a recessive trait. What is the chance that their offspring would have a smooth chin? _

5. Beyonce and Bruno are both heterozygous for brown eyes. What is the genotypic ratio for their offspring?

PLZZ HELP...i've been trying to figure this out but its just not clicking for me.

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Answer from: PinkDivaGirl02

Complete dominance occurs when the dominant allele completely masks the recessive allele in heter0zyg0us individuals. 1) 100% / 2) no chance / 3) 50% / 4) no chance / 5) 1:2:1.

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Available data:

→ Six diallelic genes code for six different traits.

→ All genes express complete dominance, meaning that the dominant allele hides the expression of the recessive one.

→ Beyonce ⇒ ee ww Dd Hh cc Bb

→ Bruno Mars ⇒ ee ww dd Hh CC Bb

→ Cross: Beyonce x Bruno Mars

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1) Earlobes

Parentals) ee x ee

Gametes) e e e e

Punnett square) e e

e ee ee

F1) 100% of the progeny is expected to have unattached earlobes, ee.

******************

2) hairline

Parentals) ww x ww

Gametes) w w w w

Punnett square) w w

w ww ww

F1) 100% of the progeny is expected to have straight hairline, ww.

There is no chance for their children to have widow’s peak because both of them are h0m0zyg0us recessive for the trait.

***********************

3) Dimples

Parentals) Dd x dd

Gametes) D d d d

Punnett square) D d

d Dd dd

F1) 2/4 = 1/2 = 50% of the progeny is expected to have dimples, dd

2/4 = 1/2 = 50% of the progeny is expected to have no dimples, Dd.

***********************

4) Chin

Parentals) CC x cc

Gametes) C C c c

Punnett square) C C

c Cc Cc

F1) 100% of the progeny is expected to have cleft chin, Cc

There is no chance for their children to have smooth chin because one of them is h0m0zyg0us dominant and the other one is h0m0zyg0us recessive for the trait. C hides the expression of c.

The whole porgeny is expected to be heter0zyg0us, Cc, expressing cleft chin.

***********************

5) Eyes

Parentals) Bb x Bb

Gametes) B b B b

Punnett square) B b

B BB Bb

b Bb bb

F1) 3/4 = 75% of the progeny is expected to have brown eyes, BB + Bb

1/4 = 25% of the progeny is expected to have blue eyes, bb

Genotypic ratio ⇒ 1:2:1 Phenotypic ratio ⇒ 3:1

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